React useEffect not updating state correctly on nested component render
Quick question that's been bugging me - I'm facing an issue with React's `useEffect` hook where the state is not updating as expected when a nested component re-renders. The parent component manages a piece of state that is passed down to a child component, which in turn uses a callback to update the parent's state. However, when the child component re-renders due to a prop change, the parent's state doesn't seem to reflect the latest updates. Here's a simplified version of my code: ```javascript import React, { useState, useEffect } from 'react'; const ParentComponent = () => { const [count, setCount] = useState(0); const handleIncrement = () => { setCount(prevCount => prevCount + 1); }; useEffect(() => { console.log('Count updated:', count); }, [count]); return ( <div> <h1>Count: {count}</h1> <ChildComponent onIncrement={handleIncrement} /> </div> ); }; const ChildComponent = ({ onIncrement }) => { return <button onClick={onIncrement}>Increment</button>; }; export default ParentComponent; ``` I expected the console to log the updated count every time I click the button, but it seems like the `useEffect` isn't firing as I anticipate when the `ChildComponent` triggers the state change. Instead, I sometimes see stale values being logged. I've checked that the `onIncrement` callback is bound correctly and that there are no unintended re-renders of the parent component that might cause it to lose the latest state. I've also tried wrapping the `setCount` function in a `useCallback` to prevent unnecessary re-creations, but that did not resolve the issue. What could be causing this behavior? I am using React 17.0.2 and functional components throughout. Any advice would be appreciated! How would you solve this?